Operation of centrifugal pumps.



E. BROWN.

OPERATION OF CENTRIFUGAL PUMPS.

APPLICATION FILED AFR.28,1911.

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UNITED snares PATENT OFFIGE.

scnu'r enovm BO'VERI & 0112., 01B BAZUEN, SWITZERLAND;

OPERATION OI" CENEBHUG'AIL Pm;

Patented July 8,1913.

Applieatlonmlad-bprllas, 1911. 801811). amass;

To :all'whom. it may-concern Be itknown that; I,.Enrc Brown, a subjectof the Kingof Great Britain) and: Inc a land, and residingat.Bahnliofwegi; Baden, Switzerland, have invented certain new: and usefullImprovements in: and Relatin utio the Operation of Centrifugal Pumps, 0which; the following is a specification.

This invention relates to the operation of centrifugal pumps,.and"hasforits. object to provide an improved method. and. apparatus efficient andeconomical in use.

It is known. that the cuuvev connecting pressure heads against which acentrifugal pump works as ordinates and volumes ofdischarge per unit oftime as abscissae first rises to a maximum and then falls. On account ofthis property, pumps which have to start against pressure, have usuallybeen provided hitherto with a valve and the discharge has been allowedto flow awa to waste until the pressure maximum has een reached. Thepump is in an unstable condition of pressure so long as it is workingbetween the limits of running idle and running at the pressure maximum,due to the fact that the cross sectional areas of running wheels anddiffusers which are designed for a given delivery are not continuouslfilled when the delivery is diminished. Ndw the above mentioned method(flowing to waste) although ermissible with umps which are started 0 yat rare interva s during the day, but it cannot usefully be employedwith pumps in which the desired delivery fluctuates within very widelimits, for instance, in the distribution of hydraulic power, feedingboilers, etc. In such installations the pump must run continuously, andgreat waste of power would result if the above method were employed.

The present invention consists in a centrifugal pump installation withcontinuous delivery and fluctuating consumption of water under pressurewith an arrangement in which the energy available in the fluid deliveredin excess of the demand at any particular moment is converted intouseful work and returned to the pump shaft without the surplus waterfirst entering the main delivery pipe.

The invention also consists in the improved methods of and means foroperating centrifugal pumps herein described.

.Refinringnow to the accompanying dia gramm'atic drawings,

"ignne ]J illustrates one example of the pnesentunv-entiomwithavertrically arranged pump: and a turbine-for utilizing the exhaust!wateiz. li ig; 2'shows a modified construction with a pump one.horizontal axis andaFelL toniwheelz lnvthe-f orm illustrated by wayofrexample in Fig. l the centrifugal pumpaldraws fIOml the suction pipeband discharges into the delivery pipe 0. From this pipe the waste,liquid. is conducted! by wayof. in pipe to-ah mnnular duct f and thenceto a reaction turbine-wheel (I mounted on the same shaft as thecentrifugal pum Below the turbine is an outlet pipe g lea ing to thesuction pipe 6 of the centrifugal pump.

In the arrangement shown in Fig. 2, a pipe 72. leads from the deliverypipe 0 directly to the nozzle of the Pelton wheel al. In this case also,the water which has passed through the turbine flows through the pipe 9back into the suction pipe b.

It will be understood that the above arrangements are described merelyby Way of example and modifications may be made as desired, for instancedevices may be provided for throwing the turbine out of operation abovethe so-called pressure maximum. The centrifugal pump may have one ormore stages and may be horizontal or vertical. The type of turbine isimmaterial. An arrangement may also be constructed in which the turbineis mounted on a separate shaft and is connected by mechanical gearing tothe pump shaft. The turbine mounted on a separate shaft may also beutilized to drive an electrical current generator, the current ,fromwhich feeds an electric motor mounted on the pump shaft. When theturbine is mounted on the same shaft as the pump, the turbine wheel maybe constructed as a pressure relieving disk and may be utilized to aidin counterbalancing the axial thrust of the pump.

Having now described my invention what I claim as new and desire tosecure by Letters Patent is 1. In combination a centrifugal pump,aturbine wheel, a common shaft connecting said pump and said wheel, afluid inlet and outlet for said centrifugal pump, means for deliveringfluid to said turbine wheel and a by-pass connection between saiddelivery means and said fluid outlet; as set forth.

2. In combination a centrifugal pump, a turbine wheel, a common shaftconnecting said pump and said wheel, a fluid inlet and outlet for saidcentrifugal pump, means for delivering fluid to said turbine wheel and aby-pass connection between said delivery means and said fluid outlet, adischarge outlet for said turbine wheel and a by-pass connection betweensaid discharge outlet of said turbine wheel and the fluid inlet of saidcentrifugal pump; as set forth.

3. In combination a centrifugal pump, a turbine wheel, a common shaftconnecting said pump and said wheel, a fluid inlet and outlet for saidcentrifugal pump, a dis charge outlet for said turbine wheel and abv-pass connection between said discharge outlet and the fluid inlet ofthe centrifugal pump; as set forth.

4. A centrlfugal pumpmg installation comprising a centrifu a1 pump and aturbine, each including a s ator and. a rotor, a mechanical connectingdevice between said rotors, an inlet and outlet for said pump and aninlet and outlet for said turbine together with hydraulic connectionsbetween said inlets and said outlets respectively; as set forth.

5. In combination a centrifugal pump and an auxiliary fluid motor, eachincluding a stator and a rotor, a mechanical connecting device betweensaid rotors, an inlet and outlet for said pump and. an inlet and outletfor said auxiliary motor together with bydraulic connections betweensaid inlets and said outlets respectively; as set forth.

In testimony whereof, I afiix my signature in presence of two witnesses.

, ERIC BROWN. Witnesses:

ARTHUR J. BUNDY, CARL GUBLER.

